Fundamentally, everyone has a pure clean mind , but it is usually covered by the defilement and dust of worldly desires which have arisen from one's circumstances . This defiled mind is not of the essences of one's nature : something has been added, like an intruder or even a guest in a home, but not its host .
The moon is often hidden by clouds , but it is not moved by them an its purity remains untarnished . Therefore , people must not be deluded into thinking that this defiled mind is their own true mind .
They must continually remind themselves of this fact by striving to awaken within themselves the pure and unchang-ing fundamental mind of Enlightenmind . Being caught b a changing , defiled mind and being deluded by their on per-verted ideas , they wander about in a world of delusion .
The disturbance and defilements of the human mind are aroused by greed as well as its reactions tothe changing circumstance .
The mind that is not disturbed by things as they occur, that remains pure and tranquil under all circumatance , is the true mind and should be the master .
we cannot say that an inn disappears just because the guest is out of sight ; neither can we say that the true self has disappeared when the defiled mind which has been aroused by the changing circumstances of life has disappeared . That which changes with changing conditions is not the true nature mind .
~ Suramgama-sutra ~